Back washing device



FIG. 1 is a right side elevational view of a back washing device,embodying our new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a cross-sectional view as seen along line 7—7 of FIG. 5;

FIG. 8 is a perspective view thereof; and,

FIG. 9 is a reduced perspective view thereof with the securing ringshown in an alternate position.

The ornamental design for back washing device, as shown and described.